It's a mum thing; mine's the same. When I visit her with my fiancée, my mum invariably does most of the food-related tricks listed above. For example, we'll reply that no, we're not hungry thanks. So 30 mins later she'll emerge from the kitchen with a couple of plates of chips, beans, sausage, eggs and bacon with hash browns. "WTF? We said we weren't hungry?!". Apparently yes she did hear, that's why there's less chips than she'd usually provide(!).
Another one she's good at is, just as we're leaving she'll mumble something about "Can you use these? Nobody here likes them...". She'll proceed to fill a couple of carrier bags with salad, nuts, fruit, yoghurts, chips, tins of beans, sausages and so on. My (much younger) sister sits in the corner with an "OMGWTFBBQ?!" look on her face as her food source is tossed into bags and thrust at us as we head for the door.
I generally enquire as to why she buys these things if 'nobody' at their house likes them, to which the reply always comes as "It's your sister. She's fussy and changes her mind a lot. Take them. No point you going hungry." Sis tends to look bemused at this statement, so mum gives her some daggers to shut her up.
Mums. Trying to feed their offspring since 288297398237892 BCE.
